Reference Data in Nantes 16 indicators covering reference data for Nantes. IndicatorLatest Year10-yr change Rank Cooling and heating degree days - Cities and FUAs — Cooling degree 87.24 Degree days 2025 up 45.1% 7th Cooling and heating degree days - Cities and FUAs — Change in cooling 23.91 Degree days 2025 up 846.6% 3rd Cooling and heating degree days - Cities and FUAs 1,385 Degree days 2025 up 7.1% 2nd Cooling and heating degree days - Cities and FUAs — Change in heating -161.19 Degree days 2025 up 36.2% 1st Cooling and heating degree days - Cities and FUAs — Change in heating 15 % change on previous year 2025 down 21.0% 6th Cooling and heating degree days - Cities and FUAs, annual growth rate 2.1 % change on previous year 2025 down 56.3% 6th Cooling and heating degree days - Cities and FUAs — Change in cooling 243.13 % change on previous year 2025 up 141.8% 1st Cooling and heating degree days - Cities and FUAs — Cooling degree 87.11 % change on previous year 2025 up 1,541.6% 1st Precipitation - Cities and FUAs — Extreme precipitation days 5.5 Days per year 2024 up 37.5% 8th Precipitation - Cities and FUAs — Change in extreme precipitation 2.81 Days per year 2024 up 114.4% 4th Dependency ratio - Cities and FUAs 23.6 Percentage of population aged 15-64 years 2022 up 7.8% 8th Wind threats - Cities and FUAs — Exposure to wind threats 0 Percentage of area 2023 — 3rd Coastal flooding - Cities and FUAs — Built-up area exposure to 0 Percentage of built-up area 2022 — 1st Main mode of transport to work - Cities and FUAs — Employed persons 206,031 Persons 2022 up 11.6% 2nd Internet speed - Cities and FUAs — Downloading speed 6.2 Percentage of national value 2025 down 85.0% 6th Internet speed - Cities and FUAs — Uploading speed 9.5 Percentage of national value 2025 down 74.4% 5th